A gilet and skinny jeans are an edgy pairing that every trendsetting gentleman should have in his menswear arsenal. And if you wish to effortlessly dress up your outfit with shoes, why not introduce brown leather casual boots to the mix? This one is a viable choice if you're putting together a killer outfit for summer-to-fall weather. This combination demonstrates that as a gentleman in his 30s, you have a wide range of sartorial options.